The greater mouse-deer, greater Malay chevrotain, or napu (Tragulus napu) is a species of even-toed ungulate in the family Tragulidae found in Sumatra, Borneo, and smaller Malaysian and Indonesian islands, and in southern Myanmar, southern Thailand, and peninsular Malaysia.

Although very small for an ungulate, the greater mouse-deer is one of the largest members of its genus.

The male has neither horns nor antlers, but has small "tusks" – elongated canines in the upper jaws.

They feed on fallen fruits, aquatic plants, buds, leaves, shrubs and grasses.

Greater mouse-deer breed throughout the year; the female spends most of her adult life pregnant.

Newborn animals are well-developed and immediately able to stand; they are fully active after 30 minutes.

The major threats to T. napu are overhunting by humans and loss of habitat[2] through rapid deforestation.